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CVE-2026-124563— D-Link DIR-878 HNAP SetWanSettings buffer overflow

Quick assessment

Affected

D-Link DIR-878

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 D-Link DIR-878 固件版本 1.20B05 中发现了一个安全漏洞。该漏洞影响 HNAP 处理器组件中的 SetWanSettings 功能。对 Primary/Secondary 参数进行恶意篡改可导致缓冲区溢出。攻击者可远程发起利用。相关利用代码已公开，可能被用于实际攻击。此漏洞仅影响已不再由维护者提供支持的產品。

CVSS 7.5 · High Updated Nov 09, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

D-Link DIR-878 HNAP SetWanSettings buffer overflow

Source: CVE Program / CVE List V5

Vulnerability Description

A security flaw has been discovered in D-Link DIR-878 1.20B05. Affected by this vulnerability is the function SetWanSettings of the component HNAP Handler. The manipulation of the argument Primary/Secondary results in buffer overflow. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. This vulnerability only affects products that are no longer supported by the maintainer.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
D-Link	DIR-878	1.20B05	`cpe:2.3:h:d-link:dir-878::::::::`

II. Public POCs for CVE-2026-124563

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-124563

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Vendor Pages for CVE-2026-124563 (1)

Smart Home, SMB and Enterprise solutions | D-Link product

Other References for CVE-2026-124563 (5)

https://github.com/Zimo-666/DIR-878-cves/tree/main/05-setwansettings-l2tp-pptp-dns-overflow broken-link exploit
https://vuldb.com/cve/CVE-2026-124563 third-party-advisory
https://vuldb.com/vuln/432895/cti signature permissions-required
https://vuldb.com/vuln/432895 vdb-entry technical-description
https://vuldb.com/submit/1035619 third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-124563

Same Patch Batch · D-Link · 2026-11-09 · 5 CVEs total

CVE-2026-124560	9.8 CRITICAL	D-Link DIR-878 HNAP prog.cgi GetCAPTCHAsetting heap-based overflow
CVE-2026-124562	7.5 HIGH	D-Link DIR-878 HNAP SetWanSettings buffer overflow
CVE-2026-124561	7.5 HIGH	D-Link DIR-878 HNAP prog.cgi SetVLANSettings stack-based overflow
CVE-2026-124564	5.3 MEDIUM	D-Link DIR-878 HNAP prog.cgi GetListDirectory path traversal

IV. Related Vulnerabilities

Same product: DIR-878

Same vendor: D-Link

Same weakness: CWE-120